Method of making dynamo-electric machines



Ap il 14, 1931. A. P. WOOD union or MAKING byumo ELECTRIC MACHINES Filed April 12, 1930 F'igi W n W W P t 3 M Wk .E H mm X U Ab l m a Apr. 14, 1931 ,QIVJQNITED STATES P AT'E NT OFFICE Autumn 2. W001), or mime-rant, maw xoax, iissxairon. are e We comm, a conromtrmn or m xoaxunion IAKING DEMO-ELECTRIC Application and April 12, 19:0. leriel re. mate,

My invention relates to .the method of making dynamo-electric machines of the type having a stationary member and a rotatable member supporte thereon by a bearing bracket. v

In manufacturing dynamo-electric machines of this type 1t is necessary to secure the bearing bracket to thestationary member 7 of the machine in such position that the rom tatable member willbe supported coaxially of the stationary member and provide a uniform air gap between the rotatable member and the core structure of the stationary member. In order to accomplish this it has heretofore been necessary in accurately machine surfaces on the stationary member of themachine which are in the same plane and which are exactly at right angles to the axis of the machine. It 7 V has a so been necessary to accurately machine surfaces on the bearing bracket WhlCh are exactly at right angles to the axis of the machine and in the same plane, so that when the bearing bracket was secured to the stationary member the axis of the rotatable member would be exactly centered in the core structure of the stationary member. This is anexpensive and troublesome method of manu facture and, articularly, in dynamo-electric machines of arge size, such as lar e alternating current enerators, because 0 the dif- -ficu1ty of hen ing the. frame structure and V the bearing bracket, in erforming themachining operations, and cause of the large and expensive equipment required to carry out the operations. The object of my invention is to carry out a'method of malcingua dynamo-electric machine of this type w the work of securing the bearing bracket to e stationary member asrequired, and will eliminate the necessity of machine work on the bearing bracket and the station memher. I accomplish this by a meth d includes placing the bearing bracket adagcent the stationary member with a plate tween them and s'eparablysecured to oneof 1 '6 them in a position to, support the rotatable member and the stationa member coaxially, and then securing theflp ate to support the set .ricate ch will greatly simpli rotatable member interl ne ,the ends of the which improved method will be more fully orth in the following description referring to the accom anying drawing, and the features of nove ty which characterize my method will be pointed out with articularity in the claims annexed to and a part of this s cification.

In the drawing Fig. 1 is a fragmentary perspective view of a dynamo-electric machine built in accordance with m invention; Fig. 2 is a perspective view showm the bearing bracket, station'ar member an plate before they are secure together; Fi 3 is a fragmentary sectional view on the line 3-3 of ig. 1 showing the bearing bracket,.stationary member and plate arran ed in accordance with my improved metho and Fig. 4 is a sectional view similar to Fig. 3 showingithe completed construction.

efe'rring to the drawing, for convenience orming 'of illustration, I have shown m improved method as a plied to the manu acture of a I vertical sha alternating current enerator having a stationary member inc uding a frame 10 having a core structure supported therein in the usualmanner, and a rotatable member which is supported on the axis of the'stationary member by a sleeve, or combined sleeve and thrust bearing, carried by a bearing bracket so as to form a uniform air gap between the rotatable member and the core structure of the stationary member. The bearin bracket preferably comprises a' fabstructure made of two parallel girders 1'1 and 12, which are secured at opposite endsthereof to the stationary member and support the bearing of the upper end of the iatethe ends h eo In order to avoid the necessity of. accurately machinin the stationary member and girders 11 and 12 constituting the upper bearing bracket of the machine, construct the same inaccordanoe with my improved method. In carryin out my method I attach'the plates 14 to t e opposite ends of'the girders 1'1 and 12 y drilling-holes 15- in the ends of the girders whic are ada ted to be aligned with tapped holerlfi mtheplate, ma thenbolt' the platesto the and a rotatable member supported thereon ers being upper surfaces of the plates 14. If the lower 'lation to the frame .tatable' member of the machine will be supported by the bearing bracket on the axis of the core structure of the stationary member plates 14 and the ends of the girders 11 and- 12, the lower surface of the ends of the girdordinarily smooth enough to fit the surfaces ,of the ends of the girders 11 and 12 need reinforcing or are not-smooth enough to fit the plates 14, I weld pads 18 to the lower surface of the ends of the girders, as indicated at19, thelower surface of the ads 18 conformin with the up er surface 0 the plates 14 to orm a separa is joint. I then arrange the bearing bracket on the frame 10 with the plate ,14 resting on the outer wall of the frame, as shown'in Fig. 3, and accurately align the bearing bracket in such rethat theaxis of the roso as .to form a uniform air gap between them. The bearing bracket may be aligned by'the use of shims or in any other convenient In this position of the bearing bracket the rotatable and stationary mem-' bers of the machine will be coaxial: I then weld the plates 14 to the opposite ends of the bearin bracket and to the frame 10, as indicate at 20 in Fig. 4, so that the bearing carried by the bearing bracket will permanently supportthe rotatable member of the machine intherequired relation to the stationary member. After the bearing bracket is secured to the stationary member in this manner, upon removal of the bolts 17 the bearing bracket can be removed from the stationary member and replaced in the correct relation thereto as the plane upper surface of the plate 14 and the end surfaces of the ends of the girders 11 and 12 form a sep'-. arable joint which will support the bearing bracket in the desired relation to the station ary member when they are bolted together again. 7

' Although I have shown my improve I method as applied to 'adynamoeelectric ma-- chine of particular construction, I donotdesire to be limited thereto, and I intend in the appended claims to cover all modifications which do not depart from' the spirit. and scope of my invention.

What I claim as new'anddesire to secure by Letters Patent of the United States, is,-

1. The method of making a dynamo-elec- 4 tric machine having a stationary member by a bearing bracket including, placing the bearing bracket adjacent the stationary member with a plate between them and sep- -to support the rotatable and stationary members coaxially,

then securing the plate to support the hearing bracket. I

2. The method of making a dynamo-electric machine having a stationary member and a rotatable member supported thereon by a bearing bracket includ1ng,-separablysecuring a p ate to the bearing bracket, arranging the bearing bracket with the plate adjacent the stationary member in position members coaxially, and securing the plate to the stationary member."

'3. The method of making a dynamo-electric machine having a stationary member and a rotatable member supported thereon by a bearing bracket including separably securinga plate to the bearing bracket, arranging the bearing bracket with the plate adjacent the stationary member in position to support the rotatable and stationary and welding the plate to the stationary member.

,4. The method of making a dynamo-electric machine having a stationary member and a rotatable member supported thereon .by a bearing bracket having plates removably secured to the ends thereof including, placing the bearing bracket adj acent the stationary member with the plates resting'on the stationary member in position to support the rotatable and stationary members .coaxially, and securing the plates to the stationary member. 4 y Y 5. The method of making a dynamo-elec tric machine having a stationary member and a rotatable member supported thereon by a bearing bracket having plates remova ly secured to the ends thereof including, placing the bearing bracket adjacent the stationary member with the plates resting on the stationary member in position to support the rotatable andstationary members coaxially, and welding the'plates to the stationary member.

In witness whereof, I have hereunto set no my hand this 11th day of April, 1930.

ALEXANDER P. WOOD.

arably secured to one of them, aligning the bearing bracket inthe relationjto the frame required to support the rotatable member and the stationary member coaxially, and- 

